Join List<string> Together with Commas Plus "and" for Last Element

Question

I know I could figure a way out but I am wondering if there is a more concise solution. There's always String.Join(", ", lList) and lList.Aggregate((a, b) => a + ", " + b); but I want to add an exception for the last one to have ", and " as its joining string. Does Aggregate() have some index value somewhere I can use? Thanks.

Answer 1

You could do this

string finalString = String.Join(", ", myList.ToArray(), 0, myList.Count - 1) + ", and " + myList.LastOrDefault(); 

Answer 2

Here is a solution which works with empty lists and list with a single item in them:

C#

return list.Count() > 1 ? string.Join(", ", list.Take(list.Count() - 1)) + " and " + list.Last() : list.FirstOrDefault(); 

VB

Return If(list.Count() > 1, String.Join(", ", list.Take(list.Count() - 1)) + " and " + list.Last(), list.FirstOrDefault())